利用select和shutdown的str_cli函数

void str_cli(FILE *fp, int sockfd)
{
int maxfdp1, stdineof;
fd_set rset;
char buf[MAXLINE];
int n;

stdineof = 0;
FD_ZERO(&rset);
for( ; ; )
{
if(stdineof == 0)
FD_SET(fileno(fp), &rset);
FD_SET(sockfd, &rset);
maxfdp1 = max(fileno(fp), sockfd) + 1;
Select(maxfdp1, &rset, NULL, NULL, NULL);

if(FD_ISSET(sockfd, &rset))	/* socket is readable */
{
if((n = Read(sockfd, buf, MAXLINE)) == 0)
{
if(stdineof == 1)
return;			/* nomal termination*/
else
err_quit("str_cli: server terminated ");
}
Write(fileno(stdout), buf, n);
}
if(FD_ISSET(fileno(fp), &rset))	/* input is readable */
{
if((n = Read(fileno(fp), buf, MAXLINE)) == 0)
{
stdineof = 1;
Shutdown(sockfd, SHUT_WR);	/* send FIN */
FD_CLR(fileno(fp), &rset);
continue;
}
Writen(sockfd, buf, n);
}
}
}